Matter Classification Matter: Anything that takes up space!!!

Atoms Elements Compounds Molecules Pure Substances A sample of matter that has definite chemical and physical properties. Atoms Elements Compounds Molecules

Elements

H2O NaCl CO2 Compounds Made of elements in a specific ratio that is always the same Has a chemical formula Can only be separated by chemical means, not physically H2O NaCl CO2

Pure Substances Element composed of identical atoms EX: copper wire, aluminum foil

Pure Substances Compound composed of 2 or more elements in a fixed ratio properties differ from those of individual elements EX: table salt (NaCl)

Two different compounds, each has a definite composition. Pure Substances For example: compounds Two different compounds, each has a definite composition.

Mixtures Variable combination of 2 or more pure substances. Heterogeneous (Mechanical Mixture) Homogeneous (solution)

Mixtures: Homogenous particles don’t settle EX: rubbing alcohol Solution homogeneous very small particles no Tyndall effect Tyndall Effect particles don’t settle EX: rubbing alcohol

Mixtures Mechanical Mixture Not of a uniform composition throughout Heterogenous

Mixtures: Heterogenous Suspension Heterogeneous When mixed, a suspension can look uniform particles settle = more than one distinct layer EX: fresh-squeezed lemonade

Mixtures vs. Compounds http://www.bbc.co.uk/schools/ks3bitesize/science/chemistry/elements_com_mix_6.shtml

Can you identify the following? You will be shown a series of photos. Tell if each photo represents an item composed of an element, compound, or mixture. Review: An element contains just one type of atom. A compound contains two or more different atoms joined together. A mixture contains two or more different substances that are only physically joined together, not chemically. A mixture can contain both elements and compounds.

Element, Compound, or Mixture? Rocks

Element, Compound, or Mixture? Rocks

Element, Compound, or Mixture? Copper

Element, Compound, or Mixture? Copper Cu

Element, Compound, or Mixture? Jelly Beans

Element, Compound, or Mixture? Jelly Beans

Element, Compound, or Mixture? Table Sugar

Element, Compound, or Mixture? Table Sugar C12H22O11

Element, Compound, or Mixture? Diamond

Element, Compound, or Mixture? Diamond C

Element, Compound, or Mixture? Tea

Element, Compound, or Mixture? Tea

Element, Compound, or Mixture? Salt

Element, Compound, or Mixture? NaCl Salt

Element, Compound, or Mixture? Neon Gas

Element, Compound, or Mixture? Ne Neon Gas

Element, Compound, or Mixture? Salad

Element, Compound, or Mixture? Salad

Element, Compound, or Mixture? Pure Water

Element, Compound, or Mixture? Pure Water H2O

Element, Compound, or Mixture? Aluminum

Element, Compound, or Mixture? Aluminum Al

Element, Compound, or Mixture? Lemonade

Element, Compound, or Mixture? Lemonade

Element, Compound, or Mixture? Silver

Element, Compound, or Mixture? Silver Ag

Element, Compound, or Mixture? Sand

Element, Compound, or Mixture? Sand